Numerical Simulation Of Regular And Irregular Wave Overtopping Against Seawalls

Traditionally, the research methods on seawall are based on experiments. Using physical wave flume, the seawall styles can be changed. Comparing the water retaining effects between different seawall styles, the optimum results will be achieve. However, physical experiments are time consuming and human power wasting, since working conditions are complex, which requires a lot of manpower and material resources. In recent years, with the development of computer technology and the fast progress of the fluid dynamics theories, numerical simulation has become more and more popular in scientific research area.In this thesis, we use computational fluid dynamics software Flow-3D to establish wave flume. Based on the Reynolds averaged Navier Stokes equation, the VOF method was used to track the free surface, and pore structure theory was used to eliminate wave at the end of the flume. Combining different parameters, the numerical two-dimensional and three-dimensional Stokes wave flume and three-dimensional random wave flume are established.We use wave height, wave spectrum and elliptic shoal calculation results to check validity of the flume. The results show the numerical results can be basically consistent with theoretical solution or physical experiment results. This shows that our method are practical in the numerical simulation of the overtopping.Using the three-dimensional random wave flume in this thesis, basing on the irregular wave overtopping physical experiments by Guangdong Research Institute of Water Resources and Hydropower, we focuses on how different slope gradient as well as intermediate platform length affect seawall overtopping. By comparison with the experimental data, it is found that the simulation of three-dimensional wave propagation and interaction is more accurate. We also found that when the water depth in front of the seawall is relatively deep enough, overtopping with the slope of steep wall increased significantly. In addition, the flow field distribution characteristics of regular waves and irregular waves are also explored in detail as well. The simulation results show that our method has high practical value in wave overtopping numerical simulation.